Arrangement for sawing stones



June I M; A. LEFEyRE 7 2,473,104

ARRANGEMENT FOR SAWING" STONES I Filed Aug. 7, 1947 III/U 82112301 Patented June 14, 1949 UNITED STATES PATEN QFFICE Application August 7, 1947, Serial No. 767,024 In France February 2, 1946 Section 1, Public Law 690, August 8, 194.6 Patent expires February 2, 1966 4 Claims.

The sawing of stone with wire carrying at intervals small elements of a very hard material such as the tungsten compounds generally known under the trade name Carboram is well known. Heretofore the hard elements were not adapted to move along the wire.

Now my invention has for its object to locate the wire elements adapted to move longitudinally over it while in almost contacting relationship with one another, said elements being seprated from one another by yielding means such as washers adapted to damp the shocks. This produces a sort of continuous system constituted by the washers and hard elements, which continuous system is entirely free to move longitudinally with reference to the wire on which it is fitted. The occurrence of discontinuous strains is thus prevented in the wire when any given element engaging the stone is subjected to a considerable resistance, such discontinuous strain leading to a breaking of the wire. Moreover it is also possible to avoid clogging of the intervals between the elements with stone-dust as may occur when they are secured rigidly to the wire, such clogging with stone-dust having a tendency to form with the wire and the hard elements a rigid unitary structure which no longer has the yieldingnes-s required for it to pass around the pulleys over which the wire is trained.

I may use round or square hard elements adapted to be rotatable around the wire which has a round cross-section; but, in a modification of my invention, the wire serving as a carrier for the hard elements may be formed with a crosssection other than circular and which may for instance be square or rectangular and the hard elements are provided with openings of corresponding shape so that they cannot rotate with reference to the wire.

It is possible to provide on the part of the pe riphery of the elements adapted to engage the stone, points of very hard material adapted to receive a suitable lateral inclination for defining the set of the sawing arrangement while the portion of the periphery of the hard elements on the side opposed to engagement with the stone may remain smooth so as not to damage the grooves of the pulleys over which the sawing arrangement is adapted to pass.

A form of embodiment selected by way of example will be described hereinafter and is illustrated in the accompanying drawings. In said drawings:

Fig. 1 is a transverse diagrammatic cross-section and Fig. 2 is a longitudinal elevational view thereof.

As shown in the drawings, there are fitted over the wire I of rectangular cross-section, elements 2 of very hard material such as the material known under the trade name Carboram, said elements being provided with openings the shape of which corresponds to that of the transverse cross-section of the wire. The portion of the periphery of the elements that is to engage the stone carries one or more points such as 3, said point being directed laterally towards the outside of the element while the following hard element has a point 3' that also directed laterally and outwardly but on the other side with reference to the axis of the wire. These points will define the set of the sawing arrangement. Obviously the points 3 and 3 may as well belong to the same element and a larger number of points may be provided. It is apparent that the rear side and lateral sides of the hard elements adapted to bear against the grooves in the pulleys should be smooth.

Between any two adjacent elements is inserted a Washer l of the type called Grower washers for instance or else there may be inserted between such two adjacent hard elements a resilient arrangement of any description preventing said adjacent hard elements from impinging against one another.

What I claim is:

1. In a device for sawing stone, an elongated flexible element, a plurality of sawing elements of very hard material threaded on said elongated element, and resilient spacer means threaded on said flexible element between each successive pair of said sawing elements, said sawing elements and said spacer means being movable to a limited extent axially of said elongated element.

2. In a device for sawing stone, an elongated flexible element of non-circular cross-section, a plurality of sawing elements of hard material formed with an aperture of complementary crosssection to that of said elongated element and threaded on said elongated flexible element and resilient spacer means interposed between said sawing elements.

3. In a device for sawing stone in combination, an elongated flexible element of non-circular cross-section, a plurality of sawing elementsformed with an aperture of complementary cross-section threaded on said flexible element and having saw-tooth projections of very hard material formed thereon in a relative position to engage a stone surface to be sawed, and a plurality of resilient spacer elements interposed between said sawing elements whereby said sawing REFERENCES CITED 3 elements are movable longitudinally :but not an- The following references are of record in the ularly with respect to said flexible element. file of this patent.

4. In a device for sawing stone, an endless elongated flexible element of non-circular cross- 5 UNITED STATES PATENTS section, a plurality of sawing. elements formed Number 4 Date with an aperture of complementary crosssection 7 Turrettim Mar. 20, 1883 threaded on said endless element each of said 641,129 Luce et a1 Ja 9 1900 sawing elements being formed with suitably H9 .3; 1,247,596 Tongberg Nov. 20, 1917 jecting saw-teeth of hard materiaLandaplgrgl- I, ity of resilient spacer elementsthreaded-onsaid --FQREIGN PATENTS endless flexible element. between saidesavvin g r Country Date elements- 436,171 France Mar. 20, 1912 MARTIAL ARIsTmEwEvREi- Certificate of Correction Patent No. 2,473,104 June 14, 1949 MARTIAL ARISTIDE LEFEVRE It is hereby certified that errors appear in the above numbered patent requiring correction as follows:

In the grant, line 14, for February 2, 1966 read February 8, 1966; in the heading to the printed specification, line 5, for February 2, 1946 read February 8, 1946'; line 7, for February 2, 1966 read February 8, 1.966;

and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 20th day of December, A. D. 1949.

THOMAS F. MURPHY,

Assistant Oommissz'oner of Patents. 

